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Abstract

2D photonic crystal (2DPC) structures consisting in 2D silicon nanopillar arrays in silica are investigated. The main motivation of this work lies in that 2D rod arrays should be easily combined with refractive structures (e. g. micro-wire waveguides), unlike 2DPC consisting in hole lattices. Such an association is expected to lead to both new functionalities and larger scale integration. In this paper, we study the loss mechanism for non degenerated Bloch modes located at Γ-point in a 2DPC slab constituted by a square lattice of silicon rods in silica. For such modes, we show that the quality factor is mainly governed by the lateral losses. To further inhibit the lateral losses, a photonic heterostructure is used. 3D FDTD calculations show that quality factors of 4000 are achieved. To reduce the vertical losses, the 2DPC heterostructure is associated with a vertical Bragg mirror, thus resulting in very high quality factors (>40000).

Figures (12)

Fig. 1. (a). View of the studied square lattice of silicon rods (top): the number of rows N is 5 in the figure. Reciprocal space associated to the square lattice (bottom). (b). Band diagram for TE polarization and for two silicon filling factors (28% and 50%): the studied A1 SBM is circled.

Fig. 3. (a). Hz component of the magnetic field in the x-y plane and the y-z plane (b). (c) and (d) are the same for Ex component of the electric field in a 11*11 silicon pillar array in silica at 1.53µm for the fundamental A1 SBM.

Fig. 8. Quality factor of the A1 SBM in the investigated heterostructure constituted by a 11*11 pillar well of filling factor 38% (a) and 50% (b) as a function of the barrier parameters: row number (1,2,3, 5) and filling factor, keeping the same lattice constant.